Browsing by Author "Nikitina, Iryna M."

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    Constructive-Synthesizing Modeling of Lightning Flashes in the Dynamic Thunderstorm Front
    (Springer, Cham, 2020) Shynkarenko, Viktor I.; Nikitina, Iryna M.; Chyhir, Robert R.
    ENG: At first, deep analysis of modeling processes of the lightning flashes dynamic behavior in static background and moving thunderstorm fronts with very mobile clouds at NASA satellite videos was done. Color models’ opportunities were explored for lightning flashes extraction in significant dynamic thunderstorm fronts and cloudiness. It was shown that the greatest efficiently in recognition is provided by combining Lab and LCH model-based features. The ranges of color channels were defined for lightning aureoles. This data was used for their detection at the series frames from meteorological satellites. The lightning detection filtering is based on the processing a current frame of the video with linear and quadratic filters were developed to solve these tasks. An analysis of their effectiveness was done. Modeling of the lightning flashes was implemented using constructive-synthesizing approach. A set of constructors was developed. Implementing parametric multi-character constructors allows forming fractal sequences of characters. Constructor-converter from the character string to time series creates fractal time series, which determine the location, magnitude and decay rate of lightning discharges. Model video images of lightning in the thunderstorm front are formed in accordance with the implementation of the constructor-assembler. The methods and software for lightning extraction from NASA satellites video, and also for realization constructive-synthesizing models were developed.
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    Modeling of Lightning Flashes in Thunderstorm Front by Constructive Production of Fractal Time Series
    (Springer, Cham, 2020) Shynkarenko, Viktor I.; Lytvynenko, Kostiantyn; Chyhir, Robert R.; Nikitina, Iryna M.
    ENG: Using the tools of structural-synthesizing modeling, a set of constructors was developed. Implementing parametric multi-character constructors allows to form fractal sequences of characters. Constructor-converter from the character string to time series creates fractal time series, which determine the location, magnitude and decay rate of lightning discharges. Model video images of lightnings in the thunderstorm front are formed in accordance with the implementation of the constructor-assembler. All constructors are developed on the basis of the generalized constructor that was previously presented and repeatedly tested. The model adequacy of the model is confirmed by comparing the video image of the model with the image, what was obtained by NASA satellite. This approach can be the basis for solving the dynamic problems on lightning protection of engineering constructions and civil objects, and development of strategy of aircraft behavior in order to mitigate the risks of lightning strokes in the conditions of movement in the thunderstorm front.